aquatic 发表于 2025-3-28 16:16:24

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defibrillator 发表于 2025-3-28 19:15:12

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查看完整版本: Titlebook: How Does One Cut a Triangle?; Alexander Soifer Textbook 2009Latest edition Springer-Verlag New York 2009 Algebra.Paul Erdös.convex figures